Jacqtjabd apparatus of looms



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UNITED STATES PATENT OFFICE.

JOI-IN A.. ELDER, OE WTESTBROOK, MAINE.

JACQU'ARD APPARATUS OF LOOMS.

Specification of Letters Patent No. 9,795, dated June 21, 1853.

To au whom t may concern Be it known that I, JOHN A. ELDER, of Westbrook, in the county of Cumberland and State of Maine, have invented certain Improvements on Looms for TWeaving Checked and Figured Fabrics; and I do hereby declare that the following is a full description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure I is a side view of the loom and mountings; E ig. II, front view of the same; Fig. III, side view of the trap-board, guidebars, knot-cords, and weights; Eig. IV, front view of the same; Fig. V, plan of the trapboard--the red lines showing the apertures in the bottom boards; Fig. VI, perspective view of two trap-board and knot cords.

The main feature of my invention consists in placing one-half of the trap-boards directly above the other half, their position being such as to allow the knot-cords to pass from their point of supervision through holes in the two trap-boards, thus placed one above the` other, and a short distance apart.

The knot-cords C, C, C, are fastened at the top to a fiXed board M, from which they descend and pass through the upper series of trap-boards A, A A Am; thence through the lower series of trap-boards B, B, B, B, thence through the eye of the horizontal needle D, thence through the upper guide-bar E, thence through the lower guide bar E; below this is the eye of the` harness G, through which the warps pass; at the lower end of each mail-cord, a weight L is attached in the usual manner. Each knotcord instead of having one trap-board knot has two knots, one above the other, to correspond with the double series of trapboards arranged between the suspension board and needles as represented.

The trap-boards A andv B, F ig. VI, are perforated with holes of the same shape, as those in common use, consisting, of a circular aperture, H, upon one side of which there is a slot, I, the circular part of the hole being of such size as to allow the knot upon the knot-cord to traverse freely through it, and the slot being of such breadth as to arrest the knot and lift the inail-cord and warp when required. In Figs. V and VI it will be noticed that the slots in the top trap-boards is in a different direction from the slots in the bottom boards, so that when one of the knot-cords is in the slot I, in the lowertrap-board, B, the upper knot can pass through the circular hole I-I in the toptrap-board A and vice versa. The vertical motion of the trap-boards is produced by suitable shafts, cams, levers and connecting rods, or cords.

Any required number of trap-boards may be used; in the present description and drawings, two series of four each are referred to. Each of the needles, D, Fig. I, has four eyes, and commands four threads of the warp; if five trap-boards are used there should be five eyes in each needle, the number of eyes being the same as the number of trap-boards in one series.

Instead of allowing the trapboard that has last operated upon the warp to rise and fall after each shot of filling the lifting cam is so shaped as to cause the trap-board to rise at the beginning of a change in the ligure and remain up during the time that the three succeeding shots of filling are inserted; in consequence of this the aggregate vertical distance traversed by the warp is much reduced, and friction and wear of the warp diminished.

By reversing the position of part of the slots in each trap-board (thus @2f-C) various changes may be produced in the figures, according as the knot cord plays through the holes or is arrested by the slot.

By this improvement the number of pattern-cords required to produce certain kinds of cloth is much reduced; the area of each cord is also much less than those now in use to produce the same effect, and only one fourth as many needles are required.

By reversing the position of the slots in one series of trap boards various changes may be produced in the gure. lVhen the slots in the top trap board is in a different direction from the slots in the bottom boards and the needles stand at rest it will weave drilling with the tweel on one side of the cloth and if the knot cords is thrown into the other series of boards the tweel will be woven on the other side. If part of the tweel should be woven on one side a card can be applied to the needles which operate the knot cords and nia-ke a change in the figure. If the change is not wanted in the ligure the needles can stand at rest. If part of the needles are pushed forward and the rest are not a part of the tweel will be woven 10 opposite directions to the knot cord holes when combined with the knot cords having a knot for each board and a single set of needles for the purpose of vibrating the knot cords from the slots in one board to the Slots in the other, the Whole arranged 15- and combined in the manner herein set forth.

JOHN A.. ELDER. [n s.] W itnessesV JAMES PENNELL, HENRY F. SANDS. 

